Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number NAS1241B3-5 found under Rivet Solid by Guardian Rivet And Fastner Inc. The National Stock Number assigned to this part is 5320015051740, and the Federal Supply Class is 5320 Rivets. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like NAS1241B3-5.